Did you upload the graphic as an attachment, as I see no file.
Is this a new install or has Windows 7 been installed for a while?
Sorry for all the questions, but..............
In order to troubleshoot your problem we need to know more detailed specs of your system hardware.
1. Go to Start > Run, and type msinfo32, look under the Components section for hardware identification
2. Go to Control Panel > Device Manager and look for any entry that has a yellow flag beside it
3. The manufacturer name and model number of your PC, if applicable
4 Please fill out your computers specs in the User Control Panel here on the site as well. It will then appear next to your name. look at my posting and you'll see the drop-down arrow.
The exact make and model of your motherboard would be of great help also.
Are you using the 32-bit or 64-bit version?
Also, go to Start > Run, and type eventvwr. Expand the Windows logs and look under Applications for red or yellow flags.
Post back with an Event ID listed under one of those red flags.
If you're willing to play around, try booting into safe mode and then disable your sound system. Reboot normal and see if these problems persist. Long shot but if nothing else works, you may as well try it.